Silicon Crystal Formation Quiz
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Questions and Answers

What occurs to the discrete atomic levels when atoms are brought closer together to form a crystal?

  • They disappear
  • They remain unchanged
  • They broaden to form bands of allowed energies (correct)
  • They become more discrete
  • What is the term for the upper band in the Energy Band Model, where electrons can easily be moved by the application of external electric fields?

  • Conduction Band (correct)
  • Valence Band
  • Energy Gap
  • Forbidden Gap
  • What type of materials have a large number of electrons in the conduction band?

  • Superconductors
  • Good conductors of electricity (correct)
  • Semiconductors
  • Insulators
  • What is the term for the series of energy levels containing valence electrons in the Energy Band Model?

    <p>Valence Band</p> Signup and view all the answers

    What is the type of bonding that occurs between silicon atoms in a solid?

    <p>Covalent</p> Signup and view all the answers

    What is the arrangement of silicon atoms in a solid?

    <p>Orderly pattern</p> Signup and view all the answers

    What is the primary reason why silicon and germanium are insulators at very low temperatures?

    <p>All the valence electrons are bound to the nucleus of their respective atoms.</p> Signup and view all the answers

    What happens to the covalent bonds in silicon and germanium at finite temperatures?

    <p>They can break, liberating an electron into the conduction band.</p> Signup and view all the answers

    What is the term for electrons that are still bound to the nucleus of their respective atoms in silicon and germanium?

    <p>Valence electrons</p> Signup and view all the answers

    What is the arrangement of atoms in the crystalline solid structure of silicon and germanium?

    <p>Tetrahedral</p> Signup and view all the answers

    What is the energy required to break a covalent bond in silicon and germanium?

    <p>Thermal energy</p> Signup and view all the answers

    What happens to the number of conduction electrons in silicon and germanium as the temperature increases?

    <p>It increases rapidly.</p> Signup and view all the answers

    In a p-type semiconductor, trivalent impurities like Boron create holes in the crystal structure due to their deficiency of how many valence electrons?

    <p>2</p> Signup and view all the answers

    What term is used to describe impurities in a semiconductor that have only 3 valence electrons and accept an electron from the doped material?

    <p>Acceptor impurities</p> Signup and view all the answers

    What term is used to describe the majority carriers in a p-type semiconductor?

    <p>Electrons</p> Signup and view all the answers

    Which of the following elements is considered a trivalent impurity in a semiconductor material?

    <p>Germanium</p> Signup and view all the answers

    What is the term used to describe a semiconductor material that has been doped with trivalent impurities and contains holes as the majority carriers?

    <p>Insulator</p> Signup and view all the answers

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